Top-seeded Serena Williams starts defending her US Open crown on Monday while Rafael Nadal and Roger Federer join her in Arthur Ashe Stadium at the year's final grand slam event.
Williams, seeking her 17th grand slam singles crown and her fifth US Open title, faces Italy's 54th-ranked Francesca Schiavone in the opening night match on the Flushing Meadows hardcourts.
"It will be a good match," Williams said. "She's a really good player. She's a big fighter and she's dangerous."
Williams, 31, is 5-2 all-time against Schiavone, including a second-round victory earlier this month at Toronto on her way to her eighth title of the season, including a grand slam crown at the French Open, and the 54th of her career. But she says she doesn't need another major to make this a special year.
"That's the beauty of my career. I don't need to do anything at all," Williams said.
"Everything I do from this day forward is a bonus. Everything for me is just extra."
Second seed Nadal, also a reigning French Open champion, launches his quest for a 13th career grand slam title against US wildcard Ryan Harrison.
The Spaniard defeated Harrison in their only prior meeting, which came in Nadal's first hardcourt match of the year in March at Indian Wells after a seven-month knee injury layoff.
Nadal went on to win at Indian Wells as well as this month at Montreal and Cincinnati and enters this US Open with a 15-0 hardcourt record this season.
"It has been great," Nadal said. "But there's no time to think about what happened. It's only time to think about what's going on. What's important is (to) try to be ready for the first round of the US Open.
"I have a tough opponent in front of me, Ryan Harrison, and I am focused on that."
Nadal, who would take home $US3.6 million by winning the title, would also end Novak Djokovic's reign as world No.1, if the Serb star also fails to reach the final for a fourth year in a row.
Federer, who at seventh is seeded in his lowest position at the US Open since 2002, suffered his earliest grand slam exit since winning his first grand slam title a decade ago with a second-round loss at Wimbledon.
The Swiss star, with a men's record 17 grand slam crowns but no US Open title since his fifth in a row in 2008, opens in a night match against Slovenia's Grega Zemlja.
Federer will match a record by making his 56th consecutive grand slam appearance, a remarkable run that began at the 2000 Australian Open.
"I've put in the hard work for so many years. That keeps my base at a very high level," Federer said. "It's actually more comfortable with my body today than it has been in the past."
Venus Williams, a seven-time grand slam champion who has been nagged by back pain and last reached a slam semi-final at the 2010 US Open, has a tough first-round match with Belgian 12th seed Kirsten Flipkens.
US 15th seed Sloane Stephens, a possible fourth-round foe for Serena Williams, opens against Luxembourg's Mandy Minella. Stephens ousted Serena Williams in the Australian Open quarter-finals and reached the last eight at Wimbledon as well.
